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From: Thomas Kellerer <[email protected]>
To: [email protected]
Subject: Re: select only 1 pair
Date: Mon, 24 Oct 2022 17:08:52 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CA+i5Jwa5VR7vJ=9S-9-d_3HgxQ_MmqwLW9+vqeN=jNDUVSVCHQ@mail.gmail.com>
References: <CA+i5Jwa5VR7vJ=9S-9-d_3HgxQ_MmqwLW9+vqeN=jNDUVSVCHQ@mail.gmail.com>

Shaozhong SHI schrieb am 24.10.2022 um 16:44:
> There are pair ids.  Each pair is repeated.
>
> id1   id2
> 1       2
> 2        1
> 3         4
> 4         3
>
> How to only select 1 unique pair for each?

select distinct least(id1,id2), greatest(id1,id2)
from the_table

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